If you experience any of the following you should go to the nearest hospital emergency department as soon as possible: 1  Heavy bleeding (soaking two pads every hour and/or passing golf ball sized clots) 2  Severe abdominal pain or shoulder pain. 3  Fever or chills. 4  Dizziness or fainting. 5  Vaginal discharge that smells unpleasant.
One of the most famous emission nebulae is the Orion Nebula (M42) located just below Orionâs belt. Another common type of emission nebula is a planetary nebula. These objects consist of a central white dwarf star surrounded by clouds of gas released as the original star evolved to the white dwarf phase.
Originally, nebula was a name for any diffuse astronomical object, including galaxies beyond the Milky Way. The Andromeda Galaxy, for instance, was referred to as the Andromeda Nebula before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble, et. al. Nebulae are often star-forming regions, such as in the Eagle Nebula.